Multiple PDF documents can be merged or concatenated together into a a single PDF file. Just instantiate the PdfFileEditor object ( JAVA version ) and call its Concatenate method ( JAVA version ) to acomplish this task. Concatenate method ( JAVA version ) will take an array of streams (holding all input PDF files as streams) that are needed to be merged and a single stream object that will store the resulting PDF file after concatenation.

 

Code Snippet

 

[C#]

 

//Create input stream objects holding the PDF files to be concatenated

FileStream inStream1 = new FileStream(".\\example1.pdf",FileMode.Open);

FileStream inStream2 = new FileStream(".\\example2.pdf",FileMode.Open);

FileStream inStream3 = new FileStream(".\\example3.pdf",FileMode.Open);

FileStream inStream4 = new FileStream(".\\example4.pdf",FileMode.Open);

 

//Create output stream object that would contain the final PDF file

FileStream outStream = new FileStream(".\\multiStream.pdf",FileMode.Create);

 

//Store all input streams in an Array

Stream[] inStreams = new Stream[]{inStream1,inStream2,inStream3,inStream4};

 

//Instantiate PdfFileEditor object

PdfFileEditor pdfEditor = new PdfFileEditor();

 

//Call Concatenate method of PdfFileEditor object to concatenate all input streams

//into a single output stream

pdfEditor.Concatenate(inStreams,outStream);

 

//Finally close the output stream

outStream.Close();

 

[VB.NET]

 

'Create input stream objects holding the PDF files to be concatenated

Dim inStream1 As FileStream =  New FileStream(".\\example1.pdf",FileMode.Open)

Dim inStream2 As FileStream =  New FileStream(".\\example2.pdf",FileMode.Open)

Dim inStream3 As FileStream =  New FileStream(".\\example3.pdf",FileMode.Open)

Dim inStream4 As FileStream =  New FileStream(".\\example4.pdf",FileMode.Open)

 

'Create output stream object that would contain the final PDF file

Dim outStream As FileStream =  New FileStream(".\\multiStream.pdf",FileMode.Create)

 

'Store all input streams in an Array

Dim inStreams() As Stream =  New Stream() {inStream1,inStream2,inStream3,inStream4}

 

'Instantiate PdfFileEditor object

Dim pdfEditor As PdfFileEditor =  New PdfFileEditor()

 

'Call Concatenate method of PdfFileEditor object to concatenate all input streams

'into a single output stream

pdfEditor.Concatenate(inStreams,outStream)

 

'Finally close the output stream

outStream.Close()

 

[JAVA]

 

try{

     //read the input file

     String inFile1 = "example1.pdf";

     String inFile2 = "example2.pdf";

     String outFile = "kitOut1.pdf";

     FileInputStream inStream1 = new FileInputStream(inFile1);

     FileInputStream inStream2 = new FileInputStream(inFile2);

 

     //concatenate two files

     FileOutputStream outputStream = new FileOutputStream(outFile);

     PdfFileEditor editor = new PdfFileEditor();

     editor.concatenate(inStream1, inStream2, outputStream);

 

     //close the output FileOutputStream

     outputStream.close();

    }catch(Exception ex){

     System.out.println(ex.getMessage());

}

 

PdfFileEditor ( JAVA version ) class has three overloaded methods of Concatenate ( JAVA version ) that can be used by developers according to their needs.